Installing Nest E Heat Link

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13 Feb 2021
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Hi everyone, I’be never posted on here before but I’m looking for some advice.

I currently have a Siemens RDJ10RF wireless thermostat which communicates with a Siemens RCR10/433-GB. The latter is wired to the boiler with a red and black wire to L and N respectively and brown wire to L1 and Blue wire to LX and a yellow/green wire. (See pic)

I’m looking to replace this with a Nest E so will have to replace the box connected to the boiler with the heat link e. I know the heat link e is battery operated so I know I won’t need the L and N feed but I’m a little confused with the other 3 wires. The options for the heat link e are labelled C, NO, FP, OT1 and OT2.

Any help would be greatly appreciated.
 

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As you have figured, Nest-e is battery operated so doesn't need a 230V supply to power it. Therefore the L & N wires are not required and should be insulated / isolated and tucked safely out of the way. Do not connect them to Nest-e

Then the wires presently in the Siemens LX and L1 simply move to Nest-e terminals that have exactly the same function as follows:

Siemens LX = Nest-e C (Common)
Siemens L1 = Nest-e NO (Normally open)

Nothing should be connected to FP, OT1 or OT2.

I can't see the green / yellow wire in your photo.
 
Last edited:
Brilliant, thanks for your help. You can’t quite see it in the photo but there is an earth wire just behind the brown and blue wires but I can’t see what that is connected to. Is there somewhere for that to go on the Nest E Heat Link?
 
Sometimes a green/yellow wire is used for a purpose other than an earth. If it's not connected to anything at the Siemens don't connect it to the Nest-e. Isolate it and tuck it out of the way. Both the Siemens and Nest-e are double insulated and do not require an earth connection.

If it is connected to one of the terminals at the Siemens post back the details.
 
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